Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-06-27
2006-06-27
Tweel, Jr., John (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S572100, C340S010300
Reexamination Certificate
active
07068172
ABSTRACT:
A deactivator for deactivating label-style EAS devices is claimed. The preferred embodiment, of which, employs a microprocessor unit to control two transceiver coils, and a deactivation coil in series with a capacitor. The two transceiver coils are essentially two flat figure eights arranged concentrically but rotated through some angle with respect to each other. The transceiver coils are operated alternatively, first transmitting an interrogation signal and then listening for a response. When an EAS device is detected, the microprocessor unit drives the capacitor and deactivation coil at the system's resonant frequency to generate a high amplitude magnetic field then shifts the frequency of the driving current away from the resonant frequency to attenuate the magnetic field. A field sensor or current sensor provides feedback to the microprocessor to determine the resonant frequency of the system during a frequency sweep.
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Fuss Arthur Bradley
Yang Xiao Hui
Foxworthy Brian W.
Tweel , Jr. John
Waters Robert R.
Waters Law Office
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